progress

Log Big Data from Model

Open the example model sldemo_fuelsys.

mdl = "sldemo_fuelsys";
open_system(mdl)

Select Configuration Parameters > Data Import/Export > Log Dataset data to file. Alternatively, you can use the set_param function to log simulation data logged using the Dataset format to a MAT-file instead of the workspace.

set_param(mdl,"LoggingToFile","on")

Simulate the model.

sim(mdl)

The MAT-file out.mat appears in your current folder. Logged signal data is stored in the MAT-file with the variable name sldemo_fuelsys_out.

Create a DatasetRef object that refers to the logged signal data.

DSRef = Simulink.SimulationData.DatasetRef("out.mat","sldemo_fuelsys_output");

Read Data and Check Progress

Use curly braces to return a SimulationDatastore representation of the fuel signal, which is the tenth element in the DatasetRef object DSRef. The SimulationDatastore object exists in the Values property of the returned Signal object.

SimDataSig = DSRef{10};
DStore = SimDataSig.Values;

The NumSamples property returns the total number of samples in the datastore.

DStore.NumSamples

ans = uint64

203009

Set the ReadSize property of Dstore to 200. Then, read from the datastore 10 times. Each read operation advances the reading position by 200 samples.

DStore.ReadSize = 200;
for i = 1:10
    read(DStore);
end

Use the progress function to determine the percentage of the total datastore that has been read.

progress(DStore)

ans = 
0.0099